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読んだら

if/when (someone) reads, after (someone) reads

→ 読む
読ん read + だ Past tense + ら Conditional (if/when)
verb · informal Rare #44,265
if/when (someone) reads, after (someone) reads The たら form can describe a condition or an action that happens first.
JA: この本を読んだら、感想を教えてください。
EN: When you’ve read this book, tell me what you think.
Conjugation of 読む
Conditional
読めば読め読んだら

先生は私たちに何を読んだらよいか教えてくれた。

The teacher told us what to read.

どっちの本を先に読んだらいいと思う？

Which book do you think I should read first?

その本読んだら、私に返してね。

Once you’ve read that book, give it back to me.

読んだら燃やしてしまうわ

Once I've read it, I'll burn it.

— 暗殺の森 (1971)